Telephone-switch



v.(Ho Model.) Y

M. G. KELLOG-G.

I Telephone Switch. No. 243,575. Patented June 28,1881.

' wmuzss s mvamon nonnsv UNITED STATES- PATENT OF ICE,

MILO G. KELLOGG, OF HYDE PARK, ASSIGNOR TO THE WESTERN ELECTRIC MANUFACTURING COMPANY, OF CHICAGO, ILLINOIS.

TELEPHONE-SWITCH.

SPECIFIGJTTION forming part of LettersPatent No. 243,575, dated June 28, 1881.

Application filed April 5, 1880.

To all whom it may concern Be it known that I, MILo G. KELLOGG, a citizen of the United States, residing at Hyde Park, in the county of Cook and State of lilinois,have invented certain new and useful Improvements in Automatic Telephone-Switches, of which the followin'gis a specification.

My invention relates to that class of telephone-station switches in which the operation I of removing the telephone from its support automatically acts to disconnect the signaling apparatus from the main line and to connect the telephone thereto, while the reverse operation of replacing the telephone upon its support in like manner disconnects the telephone from the line and restores the connection of the signaling apparatus.

Telephone switches of this character, as heretofore constructed, often fail to make a perfect electric connection between the different contact-points, and com munication is thereby partially or entirely interrupted.

The object of my invention is to provide an automatic telephone-switch which willmake a perfect electric contactunder all circumstances and conditions of ordinary use. To this end- I construct the switch or movable portion of the main circuit of conductors of a metallic 1e ver moving upon a pivot, and having an ext-em o sion orprolongation to which is aflixed a guard; The said guard, when in its normal position, is in such close proximity to the end of the stationary arm or hook which forms a support for the telephone that the latter can neither be 3 5 removed from nor replaced upon said support without pushing the said guard away from the support in one direction or the other, as the case may be, and thereby moving the arm of the switch-lever. This action causes the oppo-- 40 site extremityof the switch-lever to be thrown against the respective contact-points and retained in that position by the pressure of a spring provided for that purpose.

In the accompanying drawings, Figure 1 is 5 a perspective view of an apparatus embodying my invention, in which the telephone is represented as having been removed from its supporting-arm. Fig. 2 is a side elevation of the same, partly in section, in which the telephone is repres nted as resting upon its sup (No model.)

porting-arm. Fig. 3 is a diagram of the electrical connections as arranged for operation in connection with a transmitter, battery, and induction-coil; and Fig. 4 is a detached view of a portionot the apparatus.

The different parts of the apparatus are mounted upon and affixed to a base-board,A, of wood or other non-conducting material, which has transverse projecting pieces B B, of the same material, at its back,

Upon the face of the base-board A, and near its center, is fixed a metallic plate, D, (shown separately in Fig.4,) which is provided with a central oblong aperture,f, on each side of which is aprojection extending backward, 6 as shown at e and c A metallic switch-lever, G, is pivoted to the projections c and c at m. One arm of this lever extends backward, as shown in the figures, and is movable between two fixed contact-stops, E and E. The extremity of this arm is beveled on each side, so that its end forms asomewhat obtuse angle. A fiat spring, I), one end of which is rigidly attached to the base, is bent at its other or free end into a rib, h, of a similar an- 75 gular form, 'whichris pressed by the elasticity of the spring against the angular end of-the lever G. By reference to Figs. l and 2 it will be understood that when the end of the lever {G is moved in either direction past the rib h the pressure of the spring b, acting upon the inclined surface thereot',vwill hold the said lever firmly against the adjacent contact-points on either side. The opposite extremity of the lever G is provided with an extension or pro longation, preferably consisting of a flat spring, 6, which projects forward from the base-board, and carries upon its extremity a guard, c. This guard is arranged to movein close proximity to, but without touching, the 0 end of the upright portion 0 of the angular projecting arm or hook 0, upon which the tele* phone is hung.

The arrangement of theelectric circuits will be readily understood by reference to the fig- 5 ures. The main line L is attached to the binding-post 1, at which point it divides into two branches, one going by wire 7 through the signaling apparatus 0, and thence by wire 6 to contact-point E, while the other goes by a, 1. N g

wire 8 to binding-post 3, to which is attached a flexible conducting-cord, 10 10, passing through the telephone T and terminating at the binding-post 4, which is connected by the wire 9 with the contact E. The earth-wire or line-wire from the opposite direction, as the case may be, is attached to the post 2, which is connected by the wire5 directly with the plate D and switch-lever G. Thus it will be under stood that by moving the switch-lever G into contact with the point E or E the signaling apparatus or the telephone may respectively be placed in the circuit of the line.

By reference to Fig. 2 it will be seen that the telephone T, when in its normal position, is suspended from the supporting-arm c by means of a ring or handle, t. ln order to remove the telephone from its support for use, the ringt' must be passed over the end 0 of the support 0. In consequence of the proximity of the guard e to the end of the support, such removal cannot be effected except by pushing the guard e upward far enough to leave a space between it and the end of the support, through which the ringt' of the telephone may be passed. So, also, in replacing the telephone the guard e must be pushed downward to permit the ring to pass beneath it. The operation of pushing the guard .e in either direction causes the other end of the switch-lever G to pass by the rib h, whereupon the action of the spring 1) upon the switch-lever presses it firmly against the contact-point E, toward which it has been moved, thus insurin g a perfect electric connection at the point of contact. In order to place the telephone upon its support, it is necessary to exert a still greater pressure upon the guard e and cause the spring 0 to bend, so that the ring of the telephone can pass by the guard e, whereupon the spring 6 will assume a position which guards the supporting-arm of the telephone. This operation takes place whenever the telephone is removed from or replaced upon its support, and the telephone and the signaling apparatus are thus respectively placed in connection with the line.

I have shown the guard e in the form in which it is preferably constructed; but I do not desire to limit myself to any particular form, as this may be varied materially without departing from the spirit of my invention.

I am aware that in a telephone-station apparatus constructed prior to my invention there guard adapted to be brought close to or cover the end of said telephone-supporting arm when the telephone is in circuit and the signal out of circuit, in such a manner that the telephone cannot be hung upon its supporting-arm until the said arm of the switch is moved away from said supporting arm, the telephone being thereby switched out of and the signal into the circuit. I do not claim such combination or any part of it.

I claim as my invention 1. The combination, substantially as hereinbefore set forth, of two independent contactpoints, a pivoted switch-lever adapted to be brought in contact with either of said points, and a spring which acts automatically in either direction to press said switch lever firmly against either point with which it has been brought in contact.

2. The combination, substantially as hereinbefore set forth, of two independent contactpoints, a pivoted switch-lever adapted to be brought in contact with either of said points, a spring which acts automatically in either direction to press said switch-lever against either point with which it has been broughtin contact, an arm for supporting a telephone, and a movable guard so arranged in relation to said switch-lever and supporting-arm that the position of the lever is reversed by the act of removing the guard in order to take the telephone from the supporting-arm or to replace it thereon.

3. The combination, substantially as hereinbef'ore set forth, of two independent contactpoints, a pivoted switch lever adapted to be brought in contact with either of said points, a spring which acts automatically in either direction to press said switch -lever against either point with which it has been brought in contact, an arm for supporting a telephone, a guard for said supporting-arm, and a flexible resilient spring, by means of which said guard is attached to the movable switch-lever.

4. The combination, substantially as hereinbefore set forth, of a stationary telephonesupporting arm, a movable switch-lever, and a triangular guard mounted upon a flexible resilient extension of said lever, so that its apex will move in close proximity to the sup porting-arm.

In testimony whereof I affix my signature in presence of two witnesses.

MILO G. KELLOGG.

Witnesses:

FRANK L. Porn, WM. ARNOUX. 

